append method
Treat the contents of 'this' String as the name of a file
and appends line to the file.
If newline is null or isn't passed then the platform
end of line characters are appended as defined by
Platform().eol.
Pass null or an '' to newline to not add a line terminator. ///
e.g.
'.bashrc'.append('export FRED=ONE');
See write and truncate Use withOpenFile for better performance.
Implementation
void append(String line, {String? newline}) {
newline ??= core.eol;
withOpenFile(this, (file) {
file.append(line, newline: newline);
});
}